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Hollywood's Otto Kruger and Gertrude Michael head the cast of the British The Hidden Menace. The story takes place in a Vienna variety theatre, where a mad magician named Garvin (Kruger) periodically disposes of his romantic rivals by means of one of his deadlier hypnotic devices. His current target his high-wire artist Paul (John Clements), who is paying an inordinate amount of attention to Garvin's sweetheart, a dnacer named Yester (Gertrude Michael). The villain gets his comeuppance when one of his previous victims seemingly returns from the dead to mete out justice. Saving the film from wallowing in its melodramatic excesses are the comic interludes by pantomimist Gene Sheldon.